Cameron's trip underlines how Europe's debt-stricken states are competing to tap into one of the world's fastest-growing economies. But Friday India said it wanted to cancel a $750 million deal for a dozen helicopters made by an Anglo-Italian company due to bribery claims.

The curfew follows the secret execution of a Kashmiri man convicted for his role in a 2001 attack on India's parliament. The execution and India's crackdown have sparked talk of renewed unrest in Kashmir.

Despite a curfew, clashes broke out in India-controlled Kashmir as locals protested against what they consider the wrongful conviction of Mohammed Afzal Guru in an attack on India's Parliament in 2001.